Black Spinel 2-3x5-6mm Faceted Irregular Tyre Beads - 8-Inch 25-30mm It is not a granite

It is not a granite

It is extremely fracture to resistant and has been used for blades and other tools since Neolithic times

Green Aventurine is a green translucent quartz with glimmering metallic inclusions

which flatten the bead and pinch it tightly against the wire

Great for designers who want color variety without committing to a single tone

Black Spinel 2-3x5-6mm Faceted Irregular Tyre Beads - 8-Inch 25-30mm It is not a graniteSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.